So is there still a valid 'administrator' rank? Or is that what anybody with a purple name is, and admin is just a rank of groups like Head Developer or Community Manager? Will moderator or Sr. Staff be split up?

administrator literally just means: manager of organization .... with more staff coming, and more titles... it was more fitting to describe what each of the 'admins' did by specifying their main tasks by changing the titles to 'community manager' and 'lead developers' ....